1. A single number used to estimate a population parameter is
a. the confidence interval
b. the population parameter
c. a point estimate
d. the mean of the population
2. A range of values constructed from sample data so that the parameter occurs within that range at a specified probability is:
a. a confidence interval
b. the population parameter
c. a point estimate
d. the mean of the population
3. The size of the standard error is affected by the standard deviation of the sample and
a. a confidence interval
b. the population parameter
c. the point estimate
d. the sample size
4. Suppose we select 100 samples from a population. For each sample we construct a 95 percent confidence interval. We could expect about 95 percent of these confidence intervals to contain
a. a sample mean
b. the population mean
c. a point estimate
d. the standard deviation of the population
5. The t distribution is a continuous distribution, with many similarities to
a. the confidence interval
b. the population parameter
c. the standard normal distribution
d. the mean of the population
6. The t distribution is used when the population is normal and
a. the population standard deviation is unknown
b. the population standard deviation is known
c. the point estimate is known
d. the mean of the population is unknown
7. If the level of confidence is decreased from 95 percent to 90 percent, the width of the corresponding interval will
a. be increased
b. be decreased
c. stay the same
d. not have an effect on the level of confidence
8. The finite population correction factor is used when
a. the sample is more than 5 percent of the population
b. the sample is less than 5 percent of the population
c. the sample is larger than the population
d. the population cannot be estimated
9. A 90 percent confidence interval for means indicates that 90 out of 100 similarly constructed intervals will include the
a. sample mean
b. sampling error
c. z value
d. population mean
10. The fraction, ratio, or percent indicating the part of the sample or the population having a particular trait of interest is
a. a confidence interval
b. the population parameter
c. a point estimate
d. the proportion